考点一氧化还原反应的基本概念考点点击:对氧化还原反应的基本概念进行判断主要是抓住两条线:化合价降低→得电子→氧化剂→有氧化性→被还原→还原反应→还原产物化合价升高→失电子→还原剂→有还原性→被氧化→氧化反应→氧化产物例1反应1是自海藻灰中提取碘的主要反应,反应2是自智利硝石中提取碘的主要反应()12Na I+Mn O2+3H2SO4=2Na HSO4+Mn SO4+2H2O+I2 Examination of the basic concepts of redox reaction test sites Click to comment on the basic concept of the redox reaction is mainly to seize the two lines: valence reduction → have electronic → oxidant → oxidative → reduction → reduction → reduced product valence High → Loss of electrons → Reducing agent → Reducing → Oxidation → Oxidation → Oxidation products Example 1 Reaction 1 is the main reaction for extracting iodine from algae ash, reaction 2 is the main reaction for extracting iodine from Chilean saltpeter () 12Na I + Mn O2 + 3H2SO4 = 2Na HSO4 + Mn SO4 + 2H2O + I2